Spring data mongoDb not null annotation like Spring data Jpa - spring-data-jpa

Question

Like spring-data-jpa have #NotNull annotation what can be used for this in spring-data-mongodb.?

Answer 1

javax.validation.constraints.NotNull itself could be used with spring-data-mongodb. For this you need to have following in place.
JSR-303 dependencies added in your pom.xml
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>5.3.4.Final</version>
</dependency>
Declare appropriate validators and validator event listeners
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.mongodb.core.mapping.event.ValidatingMongoEventListener;
import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
#Configuration
public class Configuration {
#Bean
public ValidatingMongoEventListener validatingMongoEventListener() {
return new ValidatingMongoEventListener(validator());
}
#Bean
public LocalValidatorFactoryBean validator() {
return new LocalValidatorFactoryBean();
}
}
Add #NotNull annotation in your MongoDB POJO
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
import javax.validation.constraints.NotNull;
#Document(collection = "user_account")
public class User {
#Id
private String userId;
#NotNull(message = "User's first name must not be null")
private String firstName;
#NotNull(message = "User's last name must not be null")
private String lastName;
}
With this configuration and implementation, if you persist User object with null values, then you will see failure with javax.validation.ConstraintViolationException
Remember: if using #SpringBootApplication, make sure that Spring can scan your Configuration file. Otherwise, you may use #ComponentScan("com.mypackage").